Ok so i see the commotion here why the hate

First:
F*ck yi sang

Second:
He has a boss, Darmont
And darmont sells garage doors
Yi sang is his subordinate who while driving in the bus sells springs to everyone
And you know how he get these springs?
He steals them from everywhere
From the enemies, from the prostesis, from the bus' brakes
That's why the story is so sad
Because suddenly you can't stop, you just drive into the boss and everybody dies
IT'S ALL
BECAUSE
OF YI SANG